From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 58D80C5DF9D for ; Tue, 27 Oct 2020 00:32:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2186F20719 for ; Tue, 27 Oct 2020 00:32:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603758749; bh=C7kJQJ0S4jIW0hiAo8BwjaG923P/qlYE9ayfR6bR/nY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=zDqPXsH03URV0mWlgfxjyGNNSj/ZhTNSkhezKCXT5t9MR7Uaf/5Zph5bDYCSBHOed xp7aMvYBHr22NGRfK6CB+naRnKNvd+A7rwq2CO1tifCrxlIC4a2wc4O4pzScVOxlWd +o5QkcuV6Dl1faE4ZMEeyKjLQKvycWgRCPd0Oths= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2409444AbgJ0AcY (ORCPT ); Mon, 26 Oct 2020 20:32:24 -0400 Received: from mail.kernel.org ([198.145.29.99]:52396 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2409443AbgJZXvc (ORCPT ); Mon, 26 Oct 2020 19:51:32 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8671621D42; Mon, 26 Oct 2020 23:51:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603756291; bh=C7kJQJ0S4jIW0hiAo8BwjaG923P/qlYE9ayfR6bR/nY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iWoxP0l5ACOeT94f8noo2sKT0QyWRP0MNSpjZQX9VsFK9PQ/HhtHLywpHJ/KVbUD2 Sh70qZev+d6Y4qyRcaUpwuQJsBN8u/qH6eLcZGATD2ifuydZ+GRrSJ1/5FMuQlvNUS NtE80Ap9vHYbZDo1+pTONSxosxX8ZMqDYYKkKE14= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jan Kara , Andreas Dilger , Ritesh Harjani , Theodore Ts'o , Sasha Levin , linux-ext4@vger.kernel.org Subject: [PATCH AUTOSEL 5.9 119/147] ext4: Detect already used quota file early Date: Mon, 26 Oct 2020 19:48:37 -0400 Message-Id: <20201026234905.1022767-119-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201026234905.1022767-1-sashal@kernel.org> References: <20201026234905.1022767-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jan Kara [ Upstream commit e0770e91424f694b461141cbc99adf6b23006b60 ] When we try to use file already used as a quota file again (for the same or different quota type), strange things can happen. At the very least lockdep annotations may be wrong but also inode flags may be wrongly set / reset. When the file is used for two quota types at once we can even corrupt the file and likely crash the kernel. Catch all these cases by checking whether passed file is already used as quota file and bail early in that case. This fixes occasional generic/219 failure due to lockdep complaint. Reviewed-by: Andreas Dilger Reported-by: Ritesh Harjani Signed-off-by: Jan Kara Link: https://lore.kernel.org/r/20201015110330.28716-1-jack@suse.cz Signed-off-by: Theodore Ts'o Signed-off-by: Sasha Levin --- fs/ext4/super.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index ea425b49b3456..d31ae5a878594 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -6042,6 +6042,11 @@ static int ext4_quota_on(struct super_block *sb, int type, int format_id, /* Quotafile not on the same filesystem? */ if (path->dentry->d_sb != sb) return -EXDEV; + + /* Quota already enabled for this file? */ + if (IS_NOQUOTA(d_inode(path->dentry))) + return -EBUSY; + /* Journaling quota? */ if (EXT4_SB(sb)->s_qf_names[type]) { /* Quotafile not in fs root? */ -- 2.25.1